单项选择题

A．It’s not always clear why people behave in certain ways.
B．People usually blame others for their mistakes.
C．Certain conditions .cause drivers to behave strangely.
D．The reason for some behavior is obvious.
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单项选择题
A．When the ecological balance of the river is lost.B．When people consume more fish than they used to.C．When large numbers of algae, fish and birds are killed.D．When the production of marine petroleum is increased.
A．When the ecological balance of the river is lost.
B．When people consume more fish than they used to.
C．When large numbers of algae, fish and birds are killed.
D．When the production of marine petroleum is increased.
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